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Poor nitrogen removal efficiency (mainly nitrate, NO 3 − -N) at low temperatures strongly limits application of subsurface wastewater infiltration systems (SWISs). Seven psychrophilic strains (heterotrophic nitrifying bacteria and aerobic denitrifying bacteria) were isolated and added to SWISs to investigate the effect of embedding and direct-dosing bioaugmentation strategies on sewage treatment performance at low temperature. Both bioaugmentation strategies improved ammonium (NH 4 + -N) removal efficiencies, and the embedding strategy also exhibited satisfactory NO 3 − -N and total nitrogen (TN) removal efficiencies. Pyrosequencing results of the bacterial 16S rRNA gene indicated that the embedding strategy significantly decreased the indigenous soil microbial diversity ( p  < .05) and altered the bacterial community structure, significantly increasing the relative abundance of Clostridia, which have good nitrate-reducing activity. [ABSTRACT FROM AUTHOR]

The folate receptor is over expressed in a wide variety of human tumors. In this study, a novel 99m Tc-labeled folate derivative ( 99m Tc-HYNIC-T-FA) was synthesized as a potential FR-targeting imaging probe and its efficiency was evaluated. This 99m Tc-complex could be obtained through practical manner and showed improved in vivo characteristics compared with other radiofolates. Thus, this novel 99m Tc-HYNIC-T-FA compound could serve as a potential imaging agent for folate receptor positive tumors. [ABSTRACT FROM AUTHOR]